Make CompilerTask independent of compiler.

pkg/compiler/lib/src/patch_parser.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * This library contains the infrastructure to parse and integrate patch files.
  *
  * Three types of elements can be patched: [LibraryElement], [ClassElement],
  * [FunctionElement]. Patches are introduced in patch libraries which are loaded
  * together with the corresponding origin library. Which libraries that are
@@ skipping 128 matching lines @@
 import 'parser/parser.dart' show Parser;
 import 'parser/partial_elements.dart' show PartialClassElement;
 import 'parser/partial_parser.dart' show PartialParser;
 import 'scanner/scanner.dart' show Scanner;
 import 'script.dart';
 import 'tokens/token.dart' show StringToken, Token;
 
 class PatchParserTask extends CompilerTask {
   final String name = "Patching Parser";
   final ParserOptions parserOptions;
+  final Compiler compiler;
+  DiagnosticReporter get reporter => compiler.reporter;
 
-  PatchParserTask(Compiler compiler, this.parserOptions) : super(compiler);
+  PatchParserTask(Compiler compiler, this.parserOptions)
+      : compiler = compiler,
+        super(compiler.measurer);
 
   /**
    * Scans a library patch file, applies the method patches and
    * injections to the library, and returns a list of class
    * patches.
    */
   Future patchLibrary(
       LibraryLoader loader, Uri patchUri, LibraryElement originLibrary) {
     return compiler.readScript(patchUri, originLibrary).then((Script script) {
       var patchLibrary = new LibraryElementX(script, null, originLibrary);
@@ skipping 450 matching lines @@
 
 class PatchVersion {
   final String tag;
 
   const PatchVersion(this.tag);
 
   bool isActive(String patchTag) => tag == null || tag == patchTag;
 
   String toString() => 'PatchVersion($tag)';
 }